/*
 * Copyright 2019 New Vector Ltd
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package im.vector.riotx.features.settings.devices

import android.os.Bundle
import android.view.View
import android.widget.EditText
import androidx.appcompat.app.AlertDialog
import androidx.core.view.isVisible
import com.airbnb.mvrx.Async
import com.airbnb.mvrx.Loading
import com.airbnb.mvrx.fragmentViewModel
import com.airbnb.mvrx.withState
import im.vector.matrix.android.internal.crypto.model.rest.DeviceInfo
import im.vector.riotx.R
import im.vector.riotx.core.dialogs.ManuallyVerifyDialog
import im.vector.riotx.core.dialogs.PromptPasswordDialog
import im.vector.riotx.core.extensions.cleanup
import im.vector.riotx.core.extensions.configureWith
import im.vector.riotx.core.extensions.exhaustive
import im.vector.riotx.core.platform.VectorBaseActivity
import im.vector.riotx.core.platform.VectorBaseFragment
import im.vector.riotx.features.crypto.verification.VerificationBottomSheet
import kotlinx.android.synthetic.main.fragment_generic_recycler.*
import kotlinx.android.synthetic.main.merge_overlay_waiting_view.*
import javax.inject.Inject

/**
 * Display the list of the user's device
 */
class VectorSettingsDevicesFragment @Inject constructor(
        val devicesViewModelFactory: DevicesViewModel.Factory,
        private val devicesController: DevicesController
) : VectorBaseFragment(), DevicesController.Callback {

    // used to avoid requesting to enter the password for each deletion
    private var mAccountPassword: String = ""

    override fun getLayoutResId() = R.layout.fragment_generic_recycler

    private val viewModel: DevicesViewModel by fragmentViewModel()

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)

        waiting_view_status_text.setText(R.string.please_wait)
        waiting_view_status_text.isVisible = true
        devicesController.callback = this
        recyclerView.configureWith(devicesController, showDivider = true)
        viewModel.observeViewEvents {
            when (it) {
                is DevicesViewEvents.Loading            -> showLoading(it.message)
                is DevicesViewEvents.Failure            -> showFailure(it.throwable)
                is DevicesViewEvents.RequestPassword    -> maybeShowDeleteDeviceWithPasswordDialog()
                is DevicesViewEvents.PromptRenameDevice -> displayDeviceRenameDialog(it.deviceInfo)
                is DevicesViewEvents.ShowVerifyDevice   -> {
                    VerificationBottomSheet.withArgs(
                            roomId = null,
                            otherUserId = it.userId,
                            transactionId = it.transactionId
                    ).show(childFragmentManager, "REQPOP")
                }
                is DevicesViewEvents.SelfVerification   -> {
                    VerificationBottomSheet.forSelfVerification(it.session)
                            .show(childFragmentManager, "REQPOP")
                }
                is DevicesViewEvents.ShowManuallyVerify -> {
                    ManuallyVerifyDialog.show(requireActivity(), it.cryptoDeviceInfo) {
                        viewModel.handle(DevicesAction.MarkAsManuallyVerified(it.cryptoDeviceInfo))
                    }
                }
            }.exhaustive
        }
    }

    override fun showFailure(throwable: Throwable) {
        super.showFailure(throwable)

        // Password is maybe not good, for safety measure, reset it here
        mAccountPassword = ""
    }

    override fun onDestroyView() {
        devicesController.callback = null
        recyclerView.cleanup()
        super.onDestroyView()
    }

    override fun onResume() {
        super.onResume()
        (activity as? VectorBaseActivity)?.supportActionBar?.setTitle(R.string.settings_active_sessions_manage)
        viewModel.handle(DevicesAction.Refresh)
    }

    override fun onDeviceClicked(deviceInfo: DeviceInfo) {
        DeviceVerificationInfoBottomSheet.newInstance(deviceInfo.user_id ?: "", deviceInfo.deviceId ?: "").show(
                childFragmentManager,
                "VERIF_INFO"
        )
    }

//    override fun onDeleteDevice(deviceInfo: DeviceInfo) {
//        devicesViewModel.handle(DevicesAction.Delete(deviceInfo))
//    }
//
//    override fun onRenameDevice(deviceInfo: DeviceInfo) {
//        displayDeviceRenameDialog(deviceInfo)
//    }

    override fun retry() {
        viewModel.handle(DevicesAction.Refresh)
    }

    /**
     * Display an alert dialog to rename a device
     *
     * @param deviceInfo device info
     */
    private fun displayDeviceRenameDialog(deviceInfo: DeviceInfo) {
        val inflater = requireActivity().layoutInflater
        val layout = inflater.inflate(R.layout.dialog_base_edit_text, null)

        val input = layout.findViewById<EditText>(R.id.editText)
        input.setText(deviceInfo.displayName)

        AlertDialog.Builder(requireActivity())
                .setTitle(R.string.devices_details_device_name)
                .setView(layout)
                .setPositiveButton(R.string.ok) { _, _ ->
                    val newName = input.text.toString()

                    viewModel.handle(DevicesAction.Rename(deviceInfo.deviceId!!, newName))
                }
                .setNegativeButton(R.string.cancel, null)
                .show()
    }

    /**
     * Show a dialog to ask for user password, or use a previously entered password.
     */
    private fun maybeShowDeleteDeviceWithPasswordDialog() {
        if (mAccountPassword.isNotEmpty()) {
            viewModel.handle(DevicesAction.Password(mAccountPassword))
        } else {
            PromptPasswordDialog().show(requireActivity()) { password ->
                mAccountPassword = password
                viewModel.handle(DevicesAction.Password(mAccountPassword))
            }
        }
    }

    override fun invalidate() = withState(viewModel) { state ->
        devicesController.update(state)

        handleRequestStatus(state.request)
    }

    private fun handleRequestStatus(unIgnoreRequest: Async<Unit>) {
        when (unIgnoreRequest) {
            is Loading -> waiting_view.isVisible = true
            else       -> waiting_view.isVisible = false
        }
    }
}
